cleanup wrong type records, add tests

[AdoAdoAdo]

Reasoning behind the pull request

Proposed changes

Testing procedure

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[Copilot]

Pull request overview

This PR improves quarantine header handling by actively cleaning up invalid quarantined-header cache entries and adds/extends tests to cover quarantine-related error paths in block proposal validation.

Changes:

• Refactors quarantined-header sweeping into a dedicated method and removes entries with unexpected value types.
• Adds tests for sweeping expired quarantined headers and for rejecting quarantined headers during proposal validation.
• Ensures integration test nodes also close the block tracker when shutting down.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
process/track/export_test.go	Exposes sweep method and quarantine delta constant for cross-package tests.
process/track/baseBlockTrack.go	Extracts sweep logic and removes wrong-type quarantined entries (with warning).
process/track/baseBlockTrack_test.go	Adds unit tests for sweeping behavior and wrong-type cleanup.
process/block/shardblockProposal_test.go	Adds test ensuring quarantined meta headers are rejected.
process/block/metablockProposal_test.go	Adds test ensuring quarantined shard headers are rejected in sequence checks; minor variable rename.
integrationTests/testProcessorNode.go	Closes BlockTracker during integration test node shutdown.

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[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.69%. Comparing base (bf35753) to head (4c632dc).
⚠️ Report is 5 commits behind head on feat/testnet-fixes.

Files with missing lines	Patch %	Lines
process/track/baseBlockTrack.go	93.33%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##           feat/testnet-fixes    #7907      +/-   ##
======================================================
+ Coverage               77.68%   77.69%   +0.01%     
======================================================
  Files                     885      885              
  Lines                  126014   126020       +6     
======================================================
+ Hits                    97894    97917      +23     
+ Misses                  21636    21622      -14     
+ Partials                 6484     6481       -3     

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